$(document).ready(function(){
    $("ul.subnav").parent().append("<span></span>"); //Only shows drop down trigger when js is enabled - Adds empty span tag after ul.subnav
    $("ul.topnav li .topic_group").hover(function() { //When trigger is clicked...
            //Following events are applied to the subnav itself (moving subnav up and down)
            $(this).parent().find("ul.subnav").slideDown('fast').show(); //Drop down the subnav on click

            $(this).parent().hover(function() {
            }, function(){
                    $(this).parent().find("ul.subnav").slideUp('slow'); //When the mouse hovers out of the subnav, move it back up
            });

            //Following events are applied to the trigger (Hover events for the trigger)
            }).hover(function() {
                    $(this).addClass("subhover"); //On hover over, add class "subhover"
            }, function(){	//On Hover Out
                    $(this).removeClass("subhover"); //On hover out, remove class "subhover"
    });
});